Which type of muscle fibre is branched, striated, uninucleate and joined by intercalated discs?
Correct answer A. Cardiac muscle
Subject / 1,067 questions
MDCAT Biology MCQs
Page 20 of MDCAT Biology multiple-choice questions with answers. Tap an option to check yourself.
Page 20 of 54
- Biological Molecules 74
- Coordination and Control 72
- Biology Diagnostic 70
- Cell Structure and Function 67
- Biotechnology 65
- Reproduction 58
- Bioenergetics 55
- Circulation 50
- Inheritance 48
- Digestion 45
- Immunity 45
- Support and Movement 45
- Acellular Life (Viruses) 45
- Homeostasis 45
- Respiration and Gaseous Exchange 45
- Evolution 45
- Enzymes 45
- Cell Cycle 41
- Chromosome and DNA 40
- Biology Introduction 38
- Ecosystem 27
Which feature is shared by smooth and cardiac muscle but NOT by skeletal muscle?
Correct answer D. Involuntary control
Which statement summarises Lamarck’s idea of the inheritance of acquired characters?
Correct answer A. Traits developed during an organism's lifetime are passed on to its offspring
Advertisement
According to Lamarck, why have snakes lost their limbs?
Correct answer C. Continuous disuse of limbs over many generations made them disappear
Weismann cut off the tails of mice for 22 generations and found every new generation still had normal tails. Which idea did this experiment challenge?
Correct answer D. Inheritance of acquired characters
Weismann’s germ plasm theory states that ____.
Correct answer B. only changes in reproductive cells can be passed to offspring
Darwin’s ideas on natural selection were developed largely from observations made during his voyage on which ship?
Correct answer A. HMS Beagle
Which naturalist independently reached the theory of natural selection and presented it jointly with Darwin in 1858?
Correct answer B. Alfred Russel Wallace
Darwin’s idea of a ‘struggle for existence’ was strongly influenced by whose essay on human population growth?
Correct answer C. Thomas Malthus
Advertisement
In Darwin’s theory, which individuals are most likely to pass on their characteristics?
Correct answer B. Those with variations best suited to the current environment
Which of the following was a major weakness of Darwin’s original theory?
Correct answer B. It could not explain how variations arise and are inherited
The modern synthetic theory (neo-Darwinism) combines natural selection with ____.
Correct answer A. Mendelian genetics and mutation
Before the Industrial Revolution most peppered moths in England were pale; afterwards the dark form became common in polluted areas. This is an example of ____.
Correct answer D. directional selection
Human birth weight shows highest survival for babies of medium weight, with very light and very heavy babies faring worse. Which type of selection does this illustrate?
Correct answer B. Stabilising selection
In a bird population, both small-beaked and large-beaked individuals survive better than those with medium beaks because only very small and very large seeds are available. This is ____.
Correct answer A. disruptive selection
Advertisement
The rapid increase of antibiotic-resistant bacteria in hospitals is best explained by ____.
Correct answer C. selection of bacteria already carrying resistance genes
The sickle-cell allele remains common in parts of Africa because heterozygous carriers ____.
Correct answer A. are more resistant to malaria
The forelimb of a human, the flipper of a whale and the wing of a bat have the same basic bone pattern but different functions. Such organs are called ____.
Correct answer A. homologous organs
The wing of a butterfly and the wing of a bird are ____.
Correct answer D. analogous organs showing convergent evolution
Which of the following is a vestigial structure in humans?
Correct answer D. Nictitating membrane (plica semilunaris)